The big Stark Varg supermoto information topic

[Johnny Depp]

The crack of the throttle between 20 or 60 is worlds apart though...?

Wheelies kinda, but i roll on smooth on the straight an thus it is no issue. Same in the corners. Smooth opening gives a super predictable response, way smoother than any ICE.

Offcourse full power and open throttle gives both wheely and wheelspin at the same time. But since i'm not suicidal i put it in 48hp and have grip instead.

As long as you have good throttle control, the first 1/8-1/4 of the throttle is the same torque regardless of setting IMO? You don't get the big ponies until you twist it really good.

 

[Wattsthematter]

Just got my EX and mounted my supermoto 17” wheel setup and currently am running 15t front sprocket and 45t rear sprocket but my power train is cutting power at 83mph and you can feel it hit a brick wall and just kill the power it still has plenty of to keep acceleratin. I’ve seen plenty of videos where Vargs are hitting 103-107mph in plenty of YouTube videos on stock dirt wheels and tires. I was wanting to obviously find a way to remove this limitation and get a higher speed out of the bike somehow. I can’t get an answer from Stark or my local dealer about this what so ever. Anyone have any experience with this issue?

 

[Johnny Depp]

Just got my EX and mounted my supermoto 17” wheel setup and currently am running 15t front sprocket and 45t rear sprocket but my power train is cutting power at 83mph and you can feel it hit a brick wall and just kill the power it still has plenty of to keep acceleratin. I’ve seen plenty of videos where Vargs are hitting 103-107mph in plenty of YouTube videos on stock dirt wheels and tires. I was wanting to obviously find a way to remove this limitation and get a higher speed out of the bike somehow. I can’t get an answer from Stark or my local dealer about this what so ever. Anyone have any experience with this issue?

Hmm? I have mine 15/42 but haven't tried high speeds, wheels are balanced, maybe I should send it down the toll road and see? GPS speed limiting? Auto's have governor's based on the tire speed rating, just wondering..

 

[Wattsthematter]

Hmm? I have mine 15/42 but haven't tried high speeds, wheels are balanced, maybe I should send it down the toll road and see? GPS speed limiting? Auto's have governor's based on the tire speed rating, just wondering..

Please try and send it

 

[Erwin P]

As long as you have good throttle control, the first 1/8-1/4 of the throttle is the same torque regardless of setting IMO? You don't get the big ponies until you twist it really good.

No totally different on my bike.

 

[TheJ0rma]

Just got my EX and mounted my supermoto 17” wheel setup and currently am running 15t front sprocket and 45t rear sprocket but my power train is cutting power at 83mph and you can feel it hit a brick wall and just kill the power it still has plenty of to keep acceleratin. I’ve seen plenty of videos where Vargs are hitting 103-107mph in plenty of YouTube videos on stock dirt wheels and tires. I was wanting to obviously find a way to remove this limitation and get a higher speed out of the bike somehow. I can’t get an answer from Stark or my local dealer about this what so ever. Anyone have any experience with this issue?

The EX comes with shorter gearing from factory than the MX so the speedo reads lower as it is measuring the motor rpm. 83 mph speedo reading with supermoto tires and 15/45 sprockets is ~100 mph gps speed

 

[Johnny Depp]

The EX comes with shorter gearing from factory than the MX so the speedo reads lower as it is measuring the motor rpm. 83 mph speedo reading with supermoto tires and 15/45 sprockets is ~100 mph gps speed

That sounds fishy? The phone could easily do a GPS speedo app.

 

[TheJ0rma]

That sounds fishy? The phone could easily do a GPS speedo app.

Atleast in EU road regulations don't allow gps based speedo

 

[Johnny Depp]

Atleast in EU road regulations don't allow gps based speedo

Even then you would think Stark knows how to program for different gearing? On the China bikes it's easy to plug in the tire OD to calibrate your speedo, they use the typical magnetic pickup. Does the EX not have one?

 

[Johnny Depp]

An incorrect speedo still doesn't explain his bike hitting a wall and not accelerating beyond it?

 

[TheJ0rma]

The motor rpm is limited. Mine does the same thing. The bike would have the power to go way faster but it runs out of rpm

 

[DaveAusNor]

An incorrect speedo still doesn't explain his bike hitting a wall and not accelerating beyond it?

It might.
83mph is 134kph. I've that's not far off max speed with stock gearing and wheels.
His SM setup means he is actually moving approx 20% faster. (33.3% faster through gear ratio change, minus some for wheel circumference change)

• Old: 12/48=0.2512/48 = 0.2512/48=0.25
• New: 15/45=0.3333‾15/45 = 0.333 Change factor =0.3333/0.25 =1.333 → +33.3% speed

so he reads his speed at 83mph at the speedo but his gps would clock him at 100mph

 

[Johnny Depp]

The motor rpm is limited. Mine does the same thing. The bike would have the power to go way faster but it runs out of rpm

"@Rosternumberone
9 months ago
On my varg, 16 38 sprockets, dirt tires. I hit 114mph in one direction and 116 mph in other direction. It overheated and Shorted the motor. I have to replace motor and battery."

From the comments in this video. On decel with 70% Regen it fried his motor.

 

[TheJ0rma]

The bike runs out of cooling really quick even with 15/44 gearing on larger road courses. I have done a couple trackdays on my EX while waiting for parts for my race bike and you only 5 minutes on full pace before you lose all power because of overheating. With longer gearing it only gets worse.

In this video it was a cool day and a slow outlap and the bike starts to limit power at around 7 min mark. Only running 60 hp

 

[Johnny Depp]

The bike runs out of cooling really quick even with 15/44 gearing on larger road courses. I have done a couple trackdays on my EX while waiting for parts for my race bike and you only 5 minutes on full pace before you lose all power because of overheating. With longer gearing it only gets worse.

In this video it was a cool day and a slow outlap and the bike starts to limit power at around 7 min mark. Only running 60 hp

Very informative, thanks. Cooling may be the limiting factor in getting more out of these bikes? Wondering if conventional radiator placement in the airflow would help, or perhaps some sort of "airbox area" venturi effect to enhance cooling in the existing location for road track bikes. It they are developing a Supermoto model they are surely up against this same issue.

 

[Beagle]

Very informative, thanks. Cooling may be the limiting factor in getting more out of these bikes? Wondering if conventional radiator placement in the airflow would help, or perhaps some sort of "airbox area" venturi effect to enhance cooling in the existing location for road track bikes. It they are developing a Supermoto model they are surely up against this same issue.

I would guess Supermoto can accommodate the extra heft of battery liquid cooling, if needed, while it's a hard no for off-road.

 

[Wattsthematter]

So i borrowed a brand new garmin gps from a friend and again with 15t/45t sprockets and 17” supermoto setup the motor cut power at 97.65mph with a fresh charge. By the time i got out to the back road to do the speed runs the battery dropped to 98% and I did two top speed run approximately 5 minutes apart and it took me approximately .39 of a mile to hit 97.65mph. by the time I did the second run the battery had dropped to 89% and in approximately .46 of a mile i was able to hit 97.15mph and by the time i got home from doing the two runs including some cool down time my total distance travelled was approximately 4.1 miles with some distance in there to allow the everything to cool down at around 30-40mph cruise and at 25hp power.

When i parked i immediately put it in front of my big shop fan as i could definitely feel the heat from the motor/gearbox aluminum housing vicinity. I shot it with my infared thermometer and just behind the sprocket i measured 138 degrees. that was the hottest temperature of anything i could find. The ambient temp. was 89 degrees at 58% humidity.

 

[Wattsthematter]

Now that i see its not limited to any certain speed, the real enemy hear is obviously finding better cooling alternative for the motor/controller etc. Finding a way to front mount a set of radiators from like a traditional IC bike or attatching external heat sinks….something. This Florida heat/humidity just saturates the power system so dang fast! Even if your only doing a mildly spirited ride with 15t/45t gearing.

 

[Johnny Depp]

Now that i see its not limited to any certain speed, the real enemy hear is obviously finding better cooling alternative for the motor/controller etc. Finding a way to front mount a set of radiators from like a traditional IC bike or attatching external heat sinks….something. This Florida heat/humidity just saturates the power system so dang fast! Even if your only doing a mildly spirited ride with 15t/45t gearing.

Good research. SuperMoto is going to take all the gearing and cooling you can muster up.

So far no problems with tall gearing on MX track and trails at 15/42. Crossing my fingers.

 

[Wattsthematter]

"@Rosternumberone
9 months ago
On my varg, 16 38 sprockets, dirt tires. I hit 114mph in one direction and 116 mph in other direction. It overheated and Shorted the motor. I have to replace motor and battery."

From the comments in this video. On decel with 70% Regen it fried his motor.

I don’t know how this guy was able to fit a 16t front sprocket as on my ex theres no physically possible way to mount that big of a sprocket without making contact with the aluminum motor case. I only know because i already tried, lol..